This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1821537
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1821537
Title:
Enable kernel options CONFIG_EARLY_PRINTK_USB_XDBC and USB_XHCI_DBGCAP
for serial Superspeed(+) connections with kernels >= 4.16
Status in linux package in Ubuntu:
Incomplete
Bug description:
Since kernel 4.13 Linux supports an USB debug console with passive USB 3.x
host-to-host cables aka "USB 3.0 super-speed A-to-A debugging cable".
Beginning with kernel 4.16 a serial port (/dev/ttyDbC) has been added
(https://www.kernel.org/doc/html/v4.16/driver-api/usb/usb3-debug-port.html#serial-tty).
I suggest to enable USB DbC by enabling the kernel options
"CONFIG_EARLY_PRINTK_USB_XDBC=Y" and "USB_XHCI_DBGCAP=Y" in Ubuntu
kernels >= 4.16 for Bionic HWE and newer ubuntu versions.
It would also be great to get feedback about line speed from others as
USB_XHCI_DBGCAP serial ports could be used for network connections via
tun/tap devices or PPP/SLIP.
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